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Messier 14

Globular cluster in Ophiuchus

Field	Value
name	Messier 14
image	[[File:Messier 14.jpg	300px]]
caption	Globular cluster Messier 14 in Ophiuchus
epoch	J2000
class	VIII
constellation	Ophiuchus
ra
title	NGC 6402
access-date	2006-11-15
dec
dist_ly	30.3 kly
appmag_v	7.6
size_v	11.0
mass_msol
radius_ly	50 ly
metal_fe	–1.28
names	NGC 6402

| access-date=2006-11-15

Messier 14 (also known as M14 or NGC 6402) is a globular cluster of stars in the constellation Ophiuchus. It was discovered by Charles Messier in 1764.

At a distance of about 30,000 light-years, M14 contains several hundred thousand stars. At an apparent magnitude of +7.6 it can be easily observed with binoculars. Medium-sized telescopes will show some hint of the individual stars of which the brightest is of magnitude +14.

The total luminosity of M14 is in the order of 400,000 times that of the Sun corresponding to an absolute magnitude of -9.12. The shape of the cluster is decidedly elongated. M14 is about 100 light-years across.

A total of 70 variable stars are known in M14, many of the W Virginis variety common in globular clusters. In 1938, a nova appeared, although this was not discovered until photographic plates from that time were studied in 1964. It is estimated that the nova reached a maximum brightness of magnitude +9.2, over five times brighter than the brightest 'normal' star in the cluster.

Slightly over 3° southwest of M14 lies the faint globular cluster NGC 6366.

Gallery

File:M14HunterWilson.jpg|Messier 14 with amateur telescope File:M14map.png|Map showing location of Messier 14

References

"Messier 14".
distance × sin( diameter_angle / 2 ) = 50 ly radius
(31 March 2015). "Messier 14 {{!}} Messier Objects".
(August 1927). "A Classification of Globular Clusters". Harvard College Observatory Bulletin.
(November 2011). "Young Radio Pulsars in Galactic Globular Clusters". The Astrophysical Journal.

Info: Wikipedia Source

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globular-clusters ophiuchus messier-objects ngc-objects astronomical-objects-discovered-in-1764 discoveries-by-charles-messier

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